Door assembly



FIG. 1 is a perspective view of a door assembly showing my new design;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a right side elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a front elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines showing a wall is for illustrative purposes only, and forms no part of the claimed design. 

The ornamental design for a door assembly, as shown and described. 